Definition of parallelogram in English:

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Pronunciation: /ˌperəˈleləˌɡram/


Image of parallelogram
A four-sided plane rectilinear figure with opposite sides parallel.
Example sentences
  • In the deformation, the parallelograms always remain parallelograms, because their opposite sides remain equal, but the angles change.
  • Four congruent sides lie on two parallel lines, and pairs of these sides define parallelograms of equal area.
  • His vertical stripes have been put onto a slant, and whittled down to slender triangles or widened into parallelograms or pyramids.


parallelogram of forces

A parallelogram illustrating the theorem that if two forces acting at a point are represented in magnitude and direction by two sides of a parallelogram meeting at that point, their resultant is represented by the diagonal drawn from that point.
Example sentences
  • Parallelogram of Forces is the famous theorem that can be used to determine the resultant of two forces acting at a point.
  • This caused a deflection, which if it be analyzed, both directions taken together would be found to be a parallelogram of forces.


Late 16th century: from French parallélogramme, via late Latin from Greek parallēlogrammon, from parallēlos 'alongside another' + grammē 'line'.

For editors and proofreaders

Syllabification: par·al·lel·o·gram

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